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This sensor not inclued the retail packaging, if you need please leaved a message when you place the order,, thanks : )

1.Install each pair at the opposite positions.Then there is a

infrared area between these two detector parts. When someone passes the infrared region, the detector

will send alarm signal to the security alarm host (which not included here). 2. Install Distance(Max.)in the above chart means the maximum install distance between the two

detector parts. 3. Great to be installed for security system in school, office building, hosipital, home yard, etc. 4. Detecting range can be reduced to 30% in bad weather conditions, like rain, dust, etc. 5. English Usage Manual included in the pack. It will give you detailed instructions.

If the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.

Seller Service

On-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).